Question

In a random sample of 150 packages shipped by air freight, 26 had some damage.
Construct a 99% confidence interval for the true proportion of damaged packages using the large sample confidence interval formula.

zα	1.282	1.645	1.960	2.326	2.576	3.090
α(tail area)	0.1	0.05	0.025	0.01	0.005	0.001
%ile	90	95	97.5	99	99.5	99.9

Your answers can be rounded to three decimal digit accuracy when entered.

Lower limit is =				Upper limit is =

Answer 1

p = 26/150 = 0.173

Confidence interval

                               

                               

                                = (0.093 , 0.253)

Lower limit = 0.093

Upper limit = 0.253